Die rolling bar stop



' March g, 1938. H, R BENNETT 2,110,257

.D IE ROLLING BAR STOP Filed June 13,- 1936 2 Sheets-Sheet 1 HEEBEET 5E. BENNETT,

March 8, 1938.

DIE ROLLING BAR STOP Filed June 15, 1936 2 Sheets-Sheet 2 v lmmzfaz'HERBERT 0. E. BENNETT,

H. G. R. BENNETT 2,110,257-

Patented Mar. 8, 1938 UNITED STATES PATENT orrics 7 Claims.

The present invention relates to a die rolling bar stop adapted to benormally positioned between the die rolls to prevent a bar from enteringbetween the rolls until the rolls are in proper 5 rolling position andincludes means for automatically withdrawing the stop from its positionbetween the rolls to permit the bar to pass through the rolls fortreatment.

Other objects and advantages will become ap- 10 parent as thedescription proceeds in which,

Figure 1 is a side elevation of the stop bar mechanism in a positionbetween the die rolls.

Figure 2 is an end'elevation partly in section of the assembly showingthe relative positions of 15 the clutches and cam, and

Figure 3 is a diagrammatic showing of the circuit for effectingoperations of the various movements of the stop mechanism.

In the drawings, 2 and 3 represent superimposed die rolls driven by anyconventional mechanism operated by'a motor C in the direction indicatedon the drawings by the arrows. These rolls, which can contain anypractical number of units, are adapted to rotate continu- 2'5 ously inone direction, but in case of an' emergency may be reversed in rotationby reversing the direction of rotation of the motor. There isconveniently located at therear of the rolls 2 and 3, a shaft 4 suitablysecured to the frame 30 of the rolling mill and suspended therefrom andkeyed thereto is a stop rod 5 depending downwardly from the shaft,behind the rolls, and provided with a lateral horizontal extension 6projecting toward the rolls 2 and 3 which prevents 5 the bar I, normallyfed by the roll table 8 to the rolls for treatment, from entering theserolls until they are in correct operating position. Attached to theupper roll 2 is a cam member or plate 9 provided with cam surfaces orlobes I3 40 arranged to operate a limit switch II) when the rolls reachtheir proper position. In case a number of roll units are provided, thecam would have a similar number of lobes.

Mounted on a suitable support, and concentric 45 with the shaft 4, is amagnetic holding clutch l2, which magnetically looks into position, thestop rod 5 when the clutch l2 is'electrically energized. A sleeve 14 ismounted on the shaft 4 and permits rotation of the shaft within thesleeve, while 5 mounted on the sleeve l4, and revolving thereon, is amagnetic rotating clutch l5, continuously operated by an electric motorl5. Secured on one end of the shaft 4 is a cam member l'l operating alimit switch 18 adapted to energize the 55 rotating clutch I5 for movingthe stop rod 5' and lateral extension 6 away from its position betweenthe rolls and out of the path of travel of the bar 1, as shown in dottedlines in Figure 1. This limit switch is provided with contacts formaking electrical connection to contacts 30-30 5 and 34-35 to behereinafter described.

During the movement of stop rod 5 to its position shown in dotted linesin Figure 1, the cam l1 operates the limit switch [8 for de-energizingthe rotating clutch l5 and finally energizing the holding clutch I2 soas to maintain the stop rod 5 in its dotted line position out of contactwith the bar 1 and away from its position between the rolls. In order toprevent the holding clutch I2 and rotating clutch l5 from beingenergized simultaneously, which would cause damage to the equipment, theclutches l2 and 15 are electrically controlled so that both cannot beenergized a the same time.

It is possible to use different types of operating 2 circuits to controlthe various clutch operations under the present invention. However, anexample of a specific circuit which may be adopted and used to controlthe various operations of the clutches and switches is showndiagrammatically in Figure 3, and the operation is as follows.

Assuming that a bar 1 has been rolled and the main switch I!) forsupplying a source of current to the motor is closed for operating themotor C whereby the rolls 2 and 3 are rotating in the 0 directionindicated by the arrows in Figure 1, the motor It being in operation androtating the magnetic clutch 15, the subsequent operations follow:holding clutch l2 is energized to maintain the stop rod 5 up in thedotted line posiv tion shown in Figure 1, which is out of its positionbetween the rolls 2 and 3 and after a subsequent bar 1 approaches thedie rolls 2 and 3, either lobe l3 on cam 9 may operate the limit switchI!) to open its closed contact; thus, deenergizing the coil 20 andopening the normally closed contacts 22-23, thereby de-energizing theholding clutch l2 and permitting the stop rod 5 to return, by gravity,into a position between the rolls 2 and 3.

As the lobe l3 of the cam 7 moves downwardly away from the switch If],the switch is returned to its original closed position to close acircuit from line P through line 53, switch 10 and nor mally closedcontacts 3EI-3l, line 54, coil 2!]; line to line N, thereby energizingcoil 20 and closing contacts 22-23, which, in turn, complete a circuitfrom line P, through line 58, contacts 22-23, line 5|, coil of clutchl2, and line 52 to line N. This last named circuit energizes the .55

coil of clutch l2 and locks the stop-rod 5 in position between the rolls2 and 3.

As the bar I approaches the rolls, it cannot enter due to the stop-rod 5being positioned between the rolls in a locked position. The rollers ontable 8 continue to rotate until the die-rolls 2 and 3 pass through ahalf revolution and one lobe l3 of the cam 9 again operates the limitswitch I 0, opening the circuit from line P through lines 53 and 54 tocoil 20, thus de-energizing this coil and permitting contacts 22 and 23to open and break the circuit from line P through line 50, contacts22-23, and line 5| to the coil of clutch l2 whereby the clutch I2 isde-energized and the rod 5 released, which, due to its mounting, remainsin position between the rolls until the bar 1 moves into a positionbetween the rolls 2 and 3 and comes in contact with the lateralextension 6 of the stop member, and pushes it rearwardly in thedirection of its dotted line position shown in Figure 1. The stop-rod 5being moved by the bar I, rotates the shaft 4 through a small arc and,in so doing, rotates the cam II to cause its cam face 60 to engage theoperating plunger 6! of the switch l8, thus closing contacts 10 and H ofthe switch l8 and making a circuit from line P through line 56, coil 26,line 51 to line N, there by energizing coil 26 and closing contacts24-25 to complete a circuit from line P through line 58,

contacts 24-25, line 59, coil of the clutch l5,

line to line N. This last named circuit energizes the coil of clutch l5which, through its connection with the shaft 4, swings the stop-rod 5out of its position from between the rolls and the line of travel of thebar 1, thereby permitting the bar I to pass between the rolls 2 and 3for treatment, which rolls will have revolved sufiiciently to permit theplunger 6! to move outw wardly and open the contacts 10 and H of theswitch I8 which de-energizes the coil 26 and permits contacts 24-25 toopen, thereby de-energizing the coil of clutch l5 which releases thestoprod 5.

When the bar 1 moves into a position between the rolls 2 and 3 and camfacefil! of the cam l'l engages plunger 6| of switch 18 to close thecontacts HI-Has described above, the cam face 62 simultaneously releasesthe plunger 33 or" the switch l8 so as to open the contacts 30-3! of theswitch l8 so as to prevent the coil 20 from being repeatedly energizedby the switch 10 while the bar I is passing through the rolls 2 and 3.

Also simultaneously with the closing of contacts ID-H and the opening ofcontacts 30-3I, the cam face 64 of the cam I1 engages the plunger 65 ofthe switch I 8 to close contacts -86 of the switch l8 so as to closethe'line 8|.

Closing of the contacts IO-H simultaneously with the making of a circuitto the coil 26 also makes a circuit from line P through line 56, line 8|and coil of timing relay 33 to line 82, through contacts 34-35, line 83to line N, so as to energize the adjustable timing relay 33, and

close contacts 43-4l, thus energizing the holding clutch l2 during theentire time the bar 1 is passing under the stop 5. This relay 33 is setto close after a predetermined time interval so that the holding clutchI2 is energized through a normally closed switch 42, operated by thecoil 20,

thereby holding the stop-rod 5 locked in a position out of line with therolls. This condition will continue either until one of the lobes I3 ofthe cam 9 finishes passing by the switch ID for closing the circuit tothe coil 20 and energizing the holding clutch l2 through contacts 22-23.the following lobe and opening the previously energized circuit byopening the main contact switch 42 and the contacts 34-35, thus breakingthe circuit to the adjustable time relay 33, or until the limit switchI0 is opened by the following lobe E3 on cam 9 which would release thestop-rod 5 and permit it to move into a position between the rolls 2 and3.

This relay 33 is set to close after a predetermined time interval sothat the holding clutch i2 is energized through a normally closed'switch42, thereby holding the stop rod 5 locked in a position out of line withthe rolls. This condition will continue either until one of the lobes l3of cam 9 finishes passing by the switch ID for closing the circuit tocoil 2!) and energizing the holding clutch I2 through contacts 22-23 andopening the previous energized circuit by opening the main contactswitch 42 and the contacts 34-35; thus breaking the circuit to theadjustable time relay 33 or until the limit switch I0 is opened by l3 oncam 9 which would release the stop rod 5 and permit it to move into aposition between the rolls 2 and 3.

While I have shown and described one specific embodiment of myinvention, it will be understood that I do not wish to be limitedexactly thereto, since various modifications may be made withoutdeparting from the scope of my invention as defined by the followingclaims.

I claim: I

1. In combination with arbar rolling machine including bar feeding meansand die rollers, a stop adapted tobe positioned between said rollers toprevent the material from entering between the rollers until saidrollers are in operating position, means adapted to lock said stop inposition between said rollers, means adapted to withdraw said stop fromits position between said rolls and means operated by the withdrawal .ofsaidstop adapted to hold said stop in a withdrawn elevated position.

2. In combination with the bar rolling machine including bar feedingmeans and die rollers, a stop adapted to be positioned between saidrollers to prevent the material from entering between the rollers untilsaid rollers are in operating position, means adapted to lock said stopin position between said rollers, means adapted to withdraw said stopfrom its position between said rolls and time controlled means adaptedto release said stop from its with-drawn position to permit said stop togravitate to a position between said rolls.

v3. In combination with a bar rolling machine including bar feedingmeans and die rollers, a stop adapted to prevent the material fromentering between the rolls until said rolls are in oper ating position,means adapted to-withdraw said stop from' its position between saidrolls and means operated by the withdrawal of said stop from itsposition between the rolls to energize a clutch for holding said stop inits withdrawn position.

rolls, means adapted to withdraw said stop from between said rolls,means for returning said stop from its withdrawn position to a positionbetween said rolls, means on one of said rolls for operating .said lastnamed means, and means operated by the return of said stop to itsposition between the rolls to lock said stop in position.

6. In combination with a bar rolling machine including bar feeding meansand die rollers, a stop for said material positioned between the rolls,means adapted to withdraw the stop from between the rolls and meansadapted to hold said stop in a locked position out of line of the pathof the material and means on one of said rolls for releasing said stopholding means.

'7. A die rolling bar stop comprising a member adapted to be positionedbetween superimposed die rolls and provided with an upwardly extendingarm, said arm secured to a shaft and rotatable therewith, a clutchadapted to move said stop from between said rolls, a clutch adapted tomaintain said stop in withdrawn position and means on said shaft adaptedto control the oper- 10 ation of said clutches.

HERBERT G. R. BENNETT.

